11yo boy - present help

[SushiTime]

Sorry this is under AIBU but I'm wondering aimlessly and posting for traffic.

What can I get a y6 buddy for a leaving present? Age 10/11 boy.

Help would be great!

Books on a subject he's interested in? A day out somewhere? What's your budget?

I thought about £20, I don't really know him.

Christmas I got him vouchers to an ice cream shop...

My 11 YO likes:
*Rubix cubes (a current trend I think)
*PlayStation giftcard - you can often buy in Tesco etc at the gift card section. They can upload and buy whatever they like online i.e. tokens/games/Vbucks for Fortnite etc
*Waterguns (especially for summer coming up)
*Footballs NEVER go amiss I find. Sports Direct have good cheap deals
*Money in a card - this is what I do for birthday presents etc now as kids get a real kick out of being given cash and they can spend it how they like

Thanks! I found a deal on groupon for 2 Bowling, pizza and a mock tail 👏🤣